The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 1994
Filed:
May. 10, 1993
Applicant:
Inventor:
Noel A Warner, Birmingham, GB;
Assignee:
The University of Birmingham, , GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B / ;
U.S. Cl.
CPC ...
75 103 ; 75655 ;
Abstract
Zinc is recovered from zinc sulphide material by introducing such material at a feed station into a molten copper sulphide matte which is circulated in a closed loop path through said feed station, a zinc recovery station and an oxidizing station. The matte is heated electrically directly by resistive heating. Oxygen in the absence of other gases is introduced at the oxidizing station. Sulphur dioxide is removed in a sulphuric acid plant. The method is operated to keep the activity of copper in the total matte at less than unit activity. Virtually zero gas emission is possible.